Abstract
The treatment of different developmental stages and adults of Z. paravittiger with precocene, failed to produce any precocious metamorphosis, but it definitely proved to be toxic at very low doses to eggs, first instar and second instar and showed an antigonadotrophic effect when adults were topically treated. The ID50 concentrations for emergence were 0.076, 0.005, 1.00, 1000 and 90ppm for egg, first instar, second instar, third instar and pupae, respectively. The adult longevity and fecundity was reduced even when adults were treated with 0.1 ppm concentration of precoceneI, in 1 /μ1 of acetone.
Résumé
Le traitement des différentes phases développementales et des adultes du Z. paravittiger avec précocèneI n’a pas produit de métamorphose précoce, mais il s’est certainement avéré toxique à des doses très faibles aux oeufs, à la première phase métamorphologique et a manifesté un effet anti-gonadotrophique quand les adultes étaient superficiellement traités.
Les concentrations de ID50 lors de l’émergence étaient de 0,076; 0,005; 1,00; 1000 et 90 ppm pour les oeufs, la première phase, la 2me phase, la 3me phase et nymphe respectivement. La longévité et fécondité étaient réduites même quand les adultes étaient traités avec une concentration de 0,1 ppm de de précocèneI dans 1 μl d’acétone.
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Rup, P.J., Baniwal, A. Responses of Zaprionus paravittiger (Drosophilidae: Diptera) to Antijuvenile Hormone, PrecoceneI. Int J Trop Insect Sci 6, 671–675 (1985). https://doi.org/10.1017/S1742758400002885
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DOI: https://doi.org/10.1017/S1742758400002885